Predictors and growth in receptive vocabulary from 4 to 8 years in children with and without autism spectrum disorder: A population-based study.

Reichard et al. (2019) followed 4- to young learners with and without autism. They tested receptive vocabulary every year using the Peabody Picture Vocabulary Test. The sample came from a large Australian birth cohort, not a clinic. Kids took the same test at ages 4, 5, 6, 7, and 8.

Autistic children scored about 2 points lower at every age. The gap stayed the same size as both groups grew. Early language scores and nonverbal IQ at age 4 predicted how high each child would score at age 8. Classroom type or therapy hours did not change the growth curve.

Abdi et al. (2023) seems to disagree. They gave minimally verbal preschoolers a 16-session language package and saw huge receptive gains. The key difference is age and baseline: Abdi's kids were younger and had almost no words. Amanda's kids already had some vocabulary, so growth was slower.

Mas et al. (2019) extend the story to bilingual autistic children. They found no extra receptive vocabulary gap for kids hearing two languages. Together, the papers show the gap is small and does not widen, whether the child is mono- or bilingual.

Cohen et al. (1990) is an earlier cousin. They also tracked language growth in autistic and typical preschoolers. Both studies find autistic kids keep pace, just starting lower. Amanda's work updates the picture with stricter tests and longer follow-up.

You can reassure families: the vocabulary gap is small and stable. Focus goals on early language and nonverbal IQ boosters like joint attention and play skills. Do not expect classroom placement alone to close the gap; instead, target specific vocabulary in natural routines. For minimally verbal 2- to young learners, try the intensive package from Abdi et al. (2023) before the gap sets.